Aloha my fellow Spacelings,
Mark your calendar for the Maui Astronomy Club star gazing gathering Monday, November 16-- details and location forthcoming. Until then, here are a few amazing news stories from the net!
SPACE.COM - ASTEROID NEAR MISS: On Nov. 6th at 2132 UT, asteroid2009 VA barely missed Earth when it flew just 14,000 km (approx. 9000 miles) above the planet's surface. That's well inside the "Clarke Belt" of geosynchronous satellites. If it had hit, the ~6-meter wide space rock would have disintegrated in the atmosphere as a spectacular fireball, causing no significant damage to the ground. 2009 VA was discovered just 15 hours before closest approach by astronomers working at the Catalina Sky Survey.
New Saturn Ring Is Largest Known; May Solve Moon Puzzle
for National Geographic News
October 7, 2009
A newly discovered, dark ring around Saturn is the largest known planetary ring in the solar system, a new study says.
If the new ring were visible from Earth, it would look twice as wide as the full moon.Until now, that title of largest planetary ring belonged to Saturn's E ring, which orbits Saturn at a distance of about 400,000 miles (640,000 kilometers). The new Saturn ring is about 20 times farther—about 8 million miles (13 million kilometers) from Saturn (Saturn pictures).
Scientists think the new ring is made from dust-size particles kicked up as comets and other space debris slam into Saturn's outer moon Phoebe.
(Flashback picture: new Saturn ring found in 2006.)
Saturn Ring Hiding in the Dark - The ring has avoided detection until now because it's made from the same dark, carbon-rich material as Phoebe.
Though the new ring is dark, it's anything but cold—and it's that heat that gave the ring away this February, with a little help from NASA's infrared Spitzer Space Telescope.
"When you have dark objects sitting in the sun, they warm up and reemit that heat like a black car in the sun," said study team member Douglas Hamilton of the University of Maryland.
New Ring Solves Saturn Mystery?
The new ring could explain a long-standing mystery about the strange two-tone coloration of Phoebe's neighbor Iapetus, another Saturn moon (picture of Saturn moon Iapetus).
Half of walnut-shaped Iapetus is icy and bright. The other half appears to be covered in a soot-like material of mysterious origin.
Now the researchers think the dark coating comes from particles from the newly discovered ring.
It's no accident Iapetus is essentially half black and half white. The moon is gravitationally locked to Saturn like our moon is with Earth, so one side of Iapetus constantly faces Saturn.
That arrangement means the dark side of Iapetus is continually bombarded by particles from the new ring as the moon orbits Saturn, the study says.
"The dark material," Hamilton said, "hits the leading face of Iapetus like bugs on a windshield."
The new Saturn ring research is to be published in tomorrow's issue of the journalNature.
Amazing crop circles in Kansas! These are definitely the "human-made" ones.
photo from http://earthobservatory.nasa.gov